I have 19k likes but only 120 followers, is this normal?

Completely normal, this has happened since before social media was a thing...

you're basically the internet's equivalent of a one hit wonder at a karaoke bar. Everyone loves the performance, but no one’s sticking around for the album.

Yes thats actually quite a normal ratio.

Mine is 248,000 likes for 2287 followers, around 1/109th of likers follow, with 12 posts.

For you its 1/158th of likers following.

As you make more posts the ratio tends to go down, assuming they are worth watching.